By iconography do you mean only visual arts? Because much of Extreme Metal can be considered nihilist art. There is also the visual artwork associated with it, for example album art. I am particularly fond of the art of The Number of The Beast, which can be interpreted as nihilistic.

I can't help but be jealous of groups like anarchists, Christians and neo-Nazis. They have interesting if not outright beautiful iconography.

What does nihilism have? We're generally anti-symbol and anti-decoration as it is, so... a black box? An empty page? A starfield of infinite duration? A corpse? A sodomized corpse?

I want cool iconography too. I just don't trust anyone else's.

Nihilism could encompass any form of symbolism and yet not be bound to it. It cannot even be bound to it's own definition. That's why it eludes most people. A genre that can be found in all genres (but for the most part is not).

Insignia serve to distinguish between entities that collectively compose a given class. They may also identify an entity with the class it belongs to.

While there are various icons of political philosophy like the swastika, the hammer and sickle, the circle A for anarchism, and the cheeseburger for liberal democratic capitalism, there aren't any for more generalized philosophies like nihilism or existentialism.

It might not be wise to identify nihilism with a symbol, thereby implying its limitation as political philosophy within a set of competing icons. Is nihilism an equal among democracy, libertarianism, monarchism?

As an alternative, a political theory derived from nihilism could have its own anthropocentric iconographic association without adulterating the scope and gravity of its cosmic, eternal parent theory.